package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        //对前端传过来的明文密码进行md5加密
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        System.out.println("EmployeeServiceImpl当前线程id: " + Thread.currentThread().getId());

        Employee employee = new Employee();

        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);

        //设置账号状态，1 正常，2 异常
        employee.setStatus(StatusConstant.ENABLE);

        //设置密码，默认123456，存的是md5加密后的
//        employee.setPassword("123456");
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置当前记录的创建时间和修改时间...@AutoFill在Mapper里已经实现了
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录创建人id和修改人id
       //TODO 后期需要改为当前登录用户的id (动态获取)
        //employee.setCreateUser(10L);//long型
        //employee.setUpdateUser(10L);
        // 因为每一次请求都是一条线程，ThreadLocal为每个线程提供单独一份储存空间，利用这种特性，获取到当前登录的用户的id
//        employee.setCreateUser(BaseContext.getCurrentId());//在JwtTokenAdminInterceptor里的方法preHandle存入的
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);
    }

    /**
     * 分页查询
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //select * from employee limit 0,10 //从第一条开始查，一共查10条
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        //startPage和pageQuery的底层代码也是基于ThreadLocal联系在一起的
        //因为使用了PageHelper插件，所以返回值固定是Page
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);//employeePageQueryDTO里除了有page(页码)和pageSize(每页显示记录数),还有name()查询条件

        long total = page.getTotal();//总记录数
        List<Employee> records = page.getResult();//当前页数据集合

        return new PageResult(total, records);//固定参数，调用的是PageResult里的一个有参的构造方法@AllArgsConstructor
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        // update employee set status = ? where id = ?

        //1.传统方法
//        Employee employee = new Employee();
//        employee.setStatus(status);
//        employee.setId(id);

        //2.新方法
        //在Employee.java加了@Builder
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id){
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("****");//隐藏掉密码
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();//因为.xml文件里的update方法只能接受Emplyee类型的参数(parameterType="Employee")
        // (和"启用禁用员工账号"模块共用了.xml文件里update方法)
        BeanUtils.copyProperties(employeeDTO, employee);

//...@AutoFill在Mapper里已经实现了
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.update(employee);
    }
}
